The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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User Pairing and Resource Allocation for DFTS-OFDMA Uplink Systems Using Virtual MIMO

가상 여러입력 여러출력을 적용한 DFTS-OFDMA 상향 링크 시스템에서의 사용자 쌍 선택 및 자원 할당

  • 신동렬 (경희대학교 전자전파공학과) ;
  • 왕진수 (경희대학교 전자전파공학과) ;
  • 김윤희 (경희대학교 전자전파공학과)
  • Received : 2013.04.15
  • Accepted : 2013.05.15
  • Published : 2013.05.31
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Abstract

We consider user pairing and resource allocation for the uplink of cellular systems employing virtual multiple input multiple output (MIMO). As a multiple access scheme, discrete Fourier transform spread orthogonal frequency division multiple access (DFTS-OFDMA) is adopted for more flexible resource allocation than single carrier (SC)-OFDMA adopted in the Long Term Evolution (LTE) system. We formulate the optimization problems of user pairing and resource allocation to maximize the throughput of the DFTS-OFDMA system under different constraints. The DFTS-OFDMA allowing non-contiguous subcarrier allocation and redundant user assignment provides a better throughput than the SC-FDMA at lower complexity in finding the optimal solution but at the cost of the increased control information indicating the allocated resources.

본 논문에서는 셀룰러 시스템 상향 링크에서 가상 여러입력 여러출력 (multiple input multiple output: MIMO)를 적용할 때 사용자 쌍 선택 및 자원 할당 문제를 고려한다. 다중 접속 방식으로 LTE (long term evolution) 시스템의 SC-FDMA (single carrier frequency division multiple access)보다 자원 할당이 유연한 DFTS-OFDMA(discrete Fourier transform spread orthogonal FDMA) 방식을 적용하고 서로 다른 제약 조건에서 전송률을 최대로 하는 사용자 쌍 및 자원 할당 최적화 문제를 공식화하였다. 이 때 비연속 부반송파 자원을 할당하고 중복 사용자 할당을 허용하는 DFTS-OFDMA 방식은 SC-FDMA보다 전달해야 할 자원 할당 제어 정보 양은 늘어나지만 최적화 해를 쉽게 얻을 수 있고 전송률을 향상시킴을 볼 수 있다.

Keywords

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